Hi,
I'm wondering about the space performance of Clojure's persistent data
structures. For example, consider the following program, which updates
a single key in a map containing other (static) data:
(loop [m {:key 0 :a 0 :b 1 :c 2 :d 3 :e 4 :f 5 :g 6 :h 7 :i 8 :j 9}]
(if (< (:key m) 10000000)
(recur (assoc m :key (+ 1 (:key m))))))
When run the code on JDK 1.6.0_16 (64-bit server mode) with the newest
Clojure from git, the process balloons to around 400 MB! Even if I
remove keys :a through :j, it uses about 100 MB less (but 300 MB is
still a lot!). And even though I've thrown away the map at the end of
the loop, calling (System/gc) does not reduce the memory usage
significantly.
That last part confuses me quite a bit -- why is Clojure not able to
garbage collect my mess once I've thrown everything away? Is there
something I'm missing?
Thanks.
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